Friday, August 14, 2015

MAPI NSPI Issues with Exchange 2013

A customer running two Exchange 2013 CU9 multi-role servers in a cluster with an F5 load balancer contacted me this morning reporting issues where they could not create new Outlook Profiles for users. Users with existing Outlook profiles were not affected by the issue.

Users primarily connect with MAPI over HTTP which is enabled on the Exchange Organization configuration.

When a user attempted to create a new profile, they would receive the following error:The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.

When running the Microsoft Exchange Remote Connectivity Analyzer against the Exchange organisation, the following errors were captured:

After further investigation, we discovered that only mailboxes which resided on an Active database on Server1 experienced the issue creating Outlook profiles, the same server which experienced EventID 1309. After failing mailbox databases over to Server2, users were able to login to Outlook without issues.

After this we identified the issue was only present with Server1.

On Server1 we tested the NSPI website by navigating to the Exchange backend in IIS Manager and selecting Browse:444 (https).

The browse failed on Server1 with an "unhandled exception error". This was aligned with the HTTP 500 exception shown in the Event Logs on Server1 and the Exchange Remote Connectivity Analyzer.

RpcObjectSetType

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

On Server2 when repeat the same process.

On Server2 it prompted as authentication as normal.

This shows the MAPI/NSPI results as expected.

Resolution:

We rebooted Exchange Server 1 and after a reboot, it started responding to MAPI/NSPI requests as expected. We believe it was a side affect after the CU9 upgrade, however will monitor the situation and update this blog thread in the event the issue reoccurs.

9 comments:

Interestingly, we had the same issue at approximately the same date (started on Aug 13rd) and on servers that were upgraded from CU8 to CU9 as well. However CU9 was installed almost two months ago and server has been restarted multiple times in between. In our case, recycling the MSExchangeMapiAddressBook application pool immediately solved the issue. We have 24 servers and only one was affected. All servers run CU9 but only 4 of them were installed on CU8 and later upgraded.

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Just experienced this same problem on one of our four Exchange 2013 CU10 servers. Everything was working fine and then one day out of the blue, outlook users couldn't connect to the directory and had issues creating profiles and looking up GAL entries. Your blog / solution saved the day! Thx again. We restarted IIS on the server with the issue and all worked fine again. Isn't managed availability suppose to fix issues like this?!